Toothbrush



FIG. 1 is a top perspective view of a toothbrush, showing my new design;

FIG. 2 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an elevational view of the end opposite that shown in FIG. 1;

FIG. 5 is a top plan view thereof. 

The ornamental design for a toothbrush, substantially as shown and described. 